Knives of High Silica Content Glass for Thin-Sectioning

(From the Ophthalmology Branch, National Institutes of Neurological Diseases and Blindness, and the Laboratory of Physiology, National Cancer Institute, National Institutes of Health, Public Health Service, United States Department of Health, Education, and Welfare, Bethesda.)

(From the Ophthalmology Branch, National Institutes of Neurological Diseases and Blindness, and the Laboratory of Physiology, National Cancer Institute, National Institutes of Health, Public Health Service, United States Department of Health, Education, and Welfare, Bethesda.)